Combination electric-lamp bulb and diffuser.



B. L. PRENOT.

COMBINATION ELECTRIC LAMP BULB AND DIFFUSER. APPLICATION FILED JUNE 25,1912.

1,@67,599, Patented July 15, 1913.

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burrs STATES a ERNEST LEON FRENOT, F PARIS, FRANCE, ASSIGNOR T0 SDCIETELA MONDAINE, OF

PARIS, FRANCE.

COMBINATION ELECTRIC-LAMP BULB AND DIFFUSER.

Specification of Letters Patent.

Patented July 15, 1913.

Application filed June 25, 1912. Serial No. 705,792..

' To all whom it may concern:

Be it known that I, Ennns'r LnoN FRENo'r, a citizen of the Republic ofFrance, residing in Paris, Seine, France, have invented certain new anduseful Improvements in (lo-1nbination Electric-Lamp Bulbs andDiffuse-rs, of which the following is a specification.

This invention consists in the combination with an incandescent electriclamp bulb of a difi'user globe surrounding the same and having its basefixed, together with the cap of the lamp bulb, in an outer cap servingfor fitting the electric lamp in a lamp holder similarly to an ordinaryelectric lamp.

The diffusion of the light is efiected by the globe surrounding thebulb, for which purpose the globe is made with internal projections orfacets of prismatic shape, or in the form of ribs or ridges, saidprojections, ribs or ridges being produced by blowing the'globe in amold in such manner that the thickness of the glass is uniformthroughout. By this means loss of efiiciency is avoided, and the lightrays are retracted and diffused by the interior surfaces of the globebefore being distributed in the room or other space.

The cap of the bulb and the base of the globe are so mounted in theouter cap as to insulate the globe thermally from the lamp andtopreserve the lamp.

The protectin globe is formed with holes which rovide or a current ofair between the globe and the lamp bulb, so that the air heated by thebulb escapes and is replaced by cool air, which further contributes tothe preservation of the lamp.

The accompanying drawings illustrate by way of example, various forms ofelectric bulbs combined with protecting diffuser globes in accordancewith the invention.

Figure 1 shows on an enlarged scale an incandescent electric lamp withits diffuser globe, the latter being in section. Fig. 2 is a fragmentaryview of the outside of the diffuser. Fig. 3 is a horizontal section online M, M, Fig. 2. Figs. 4, 5 and 6 illustrate different forms of lamps.

The electric lamps employed are preferably of the tubular cylindrical.type, as shown at A, and of suthciently small diameter to be inser. dthrough the base of the difi'user globe B. This globe which mayadvantageously be of frosted glass, white or colored, has internalpyramidal projections projections.

(1, preferably quadrangular, produced by blowing the glass in a moldhaving internal The thickness of the glass is thereforeuniformthroughout, so that a hollow on the outer surface of the globecorresponds to a projection on the interior surface of the globe. nottherefore to pass through different thicknesses of glass andthus therefraction and diffusion of the rays does not result from differentthicknesses of glass as would be the case, for example, with globeshaving projections molded or cut on their outer sur-' face; therefraction and diifusion are due solely to the geometrical distortion ofthe material of the globe. This globe of thin glass is very cheap,whereasglobes with projections molded or cut on their face are veryexpensive.

The lamp bulb and its globe are fitted in an outer metal cap C, with theaid of a ring D of fiber, compressed asbestos or other heat insulatingmaterial disposed in the outer capC inside a packing of cotton 7). "Thecap E of the lamp bulb A has likewise a packing ring or collar of cotton0. The cap of the bulb with its collar 0 is forced into the fiber ring1), and the bulb is thus firmly held coaxially with the globe B.

In fitting the lamp in the cap (I as explained, the metal conductors fto which the ends of the lamp filament :20 are fixed are passed throughthe holes (Z formed in the insulating end or plug a of the cap C, andthese conductors are afterward. secured by drops or beads of solder gfor contacting with the terminals of the lamp holder. Direct contact ofthese terminals with the conductors of the lamp is thus provided for.The base F of, the diiiuser globe B is also fixed in the cap 0 by simplyapplying a lit tle plaster to the outside of the base beforeinserting itin the cap C. The cotton surrounding thecap of th'e'lamp prevents theexistence of moisture liable to cause short circuits, and moreover thelamp thus mounted is not liable to become hot, so that it lasts longer.

The globe inclosing the lamp bulb is formed with holes a, for example,there may be three at the base and one at the top; these admit the airfreely and allow the hot air in the space between the bulb and the globeto escape readily. The lamp is thus ventilated, cooled and preserved 'iuwhatever The rays of lighthave position it may be fitted, as shown, forexample, in Figs. 4 to 6.

The globe may be of ovoidal, spherical, pear-shaped or any othersuitable form. Instead of making the interior; of the globe withpyramidal projections, I may form it with longitudinal ridges or ribs asseen for example, in Fig. 6.

Claims:

1. An incandescent lamp comprising a cap or base adapted to fit into anelectricalv socket-piece of ordinary construction, said cap having asockettherein for an ordinary incandescent lamp having a bulb of greaterdiameter than the socket-piece in which the cap or base is adapted tofit, and a larger socket for a surrounding globe.

2. An incandescent lamp comprising a cap or base adapted to fit into anelectrical socket-piece of ordinary construction, saidcap having asocket therein for an ordinary incandescent lamp having a bulb ofgreater diameter than the socket-piece in which the cap or base isadapted to fit, and a larger socket for a surrounding globe, and meansfor thermally insulating said incandescent lamp from said cap.

3. An incandescent, lamp comprising a cap or base adapted to fit into anelectrical socket-piece of ordinary construction, said cap having asocket therein for an ordinary incandescent lamp having a bulb ofgreater diameter than the socket-piece in which the cap or base isadapted to'fit, and a larger socketfor a surrounding globe, said lampprojecting through having its filament-leads and attached to said cap.

4:. An incandescent. lamp comprising a cap or base adapted to fit intoan electrical s0cket-piece of ordinary construction, said cap having asocket therein for an ordinary incandescent lamp having a bulb of reaterdiameter than the socket-piece in which the cap or base is adapted tofit, and a larger socket for a surrounding globe, and means forelectrically and thermally insulating said lamp from said cap.

5., An incandescent lamp comprising a cap or base adapted to fit into anelectrical socket-piece of ordinary construction, said cap having asocket therein for an ordinary incandescent lamp having a bulb ofgreater diameter than the socket-piece in Which the cap or base isadapted to fit, and a larger socket for a surrounding globe, and meansfor uniting said globe to said cap.

6. Anincandescent lamp comprising a cap or base adapted to fit into anelectrical socket-piece of ordinary construction, said cap having asocket therein for an ordinary incandescent lamp having a bulb ofgreater diameter than the socket-piece in which the cap or base isadapted to fit, and a larger socket for a surrounding globe, and amoisture-repellent packing between said globe and saidlamp on theinterior of the cap.

In Witness whereof, I have hereunto,

signed my name in the presence of two subscribing witnesses.

ERNEST LEON Fniauor. Witnesses H. O. Conn,

, Rania BARDY.

